From: S2 <z@...>
Date: 2008-04-26T23:00:04+09:00
Subject: Re: All occurances of a  character in a string

S2 wrote:

> irb(main):006:1>   ret[c] = ret[c].nil? ? d : d << ret[c]
> irb(main):007:1>   ret[c].flatten!

oh sorry, here are a few things that are not needed:
a = "abbccdaab"
i = 0
ret = Hash.new
a.scan(/./) {|c|
  ret[c] = ret[c].nil? ? [i] : ret[c] << i
  i = i + 1
}
p a
p ret